Black opal (Black and Dark opal or semi-black) - the color of the base material is black, semi-black, dark gray to light gray. Coloring is due to the presence of carbonaceous substances in the molecular structure. It features a number of beautifully opalescent rich colors highlighted with black or dark backgrounds. It is always accompanied by a general opal, the so-called "dots" (the same color as the base mass). black opal is found in layers of clay.
Natural precious opal from Australia (Lightning Ridge) 11,3x5,9x3,1mm, 1,13ct
Natural precious opal from Australia (Lightning Ridge) 6,8x5,6x1mm, 0,18ct
Natural precious opal from Australia (Lightning Ridge) 7,9x6,5x1mm, 0,25ct
Natural precious opal from Australia (Lightning Ridge) 8,8x7,7x1,5mm, 0,54ct
Natural precious opal from Australia (Lightning Ridge) 8,8x6,6x2,5mm, 0,81ct
Natural precious opal from Australia (Lightning Ridge) 13,4x7,9x1,1mm, 0,68ct
Natural precious opal from Australia (Lightning Ridge) 16x8x1,6mm, 1ct
Natural precious opal from Australia (Lightning Ridge) 6,5x2mm, 0,59ct
Natural precious opal from Australia (Lightning Ridge) 8,8x7x1,4mm, 0,51ct
Natural precious opal from Australia (Lightning Ridge) 11,4x7,9x3mm, 1,3ct
Natural precious opal from Australia (Lightning Ridge) 11,8x5x1,8mm, 0,81ct
Natural precious opal from Australia (Lightning Ridge) 15,2x10,8x23mm, 1,67ct
Natural precious opal from Australia (Lightning Ridge) 15,2x8x2,7mm, 2,19ct
Natural precious opal from Australia (Lightning Ridge) 15,3x9,8x4mm, 4,21ct
Natural precious opal from Australia (Lightning Ridge) 14,3x13,3x3,3mm, 3,26ct
Natural precious opal from Australia (Lightning Ridge) 10x6,4x3,5mm, 1,25ct
Natural precious opal from Australia (Lightning Ridge) 16,2x6,6x2,7mm, 2ct
High quality rough precious opal from Australia (Lightning Ridge) - a mixture of quality opals with rare and distinctive colours.
High quality rough precious opal from Australia (Lightning Ridge) - a mixture of quality opals with rare and distinctive colours.
High quality rough precious opal from Australia (Lightning Ridge) - a mixture of quality opals with rare and distinctive colours.
High quality rough precious opal from Australia (Lightning Ridge) - a mixture of quality opals with rare and distinctive colours.
High quality rough precious opal from Australia (Lightning Ridge) - a mixture of quality opals with rare and distinctive colours.
Natural precious opal from Australia (Lightning Ridge) 19,3x12,6x3,5mm, 5,42ct
Natural precious opal from Australia (Lightning Ridge) 11x10x5mm, 2,93ct
Natural precious opal from Australia (Lightning Ridge) 21x7,5x3mm, 2,66ct
Natural precious opal from Australia (Lightning Ridge) 13,6x7,8x3mm, 2,2ct
Natural precious opal from Australia (Lightning Ridge) 14,8x7,9x4mm, 2,66ct
Natural precious opal from Australia (Lightning Ridge) 19,9x11,7x2,9mm, 3,86ct
Natural precious opal from Australia (Lightning Ridge) 22,2x12,4x5,6mm, 9,39ct
Natural precious opal from Australia (Lightning Ridge) 10,9x8,2x2,5mm, 1,36ct
Natural precious opal from Australia (Lightning Ridge) 16,7x10,3x2,4mm, 2,64ct
Natural precious opal from Australia (Lightning Ridge) 18,6x10,5x2,1mm, 2,33ct
Natural precious opal from Australia (Lightning Ridge)...